import java.util.Scanner;

/**
 * Created by L.jp
 * Description:
 * User: 86189
 * Date: 2023-04-15
 * Time: 21:22
 */
public class Solution4 {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        int n=scanner.nextInt();
        String str=String.valueOf(n);
        int len=str.length();
        StringBuilder left=new StringBuilder();
        for(int i=0;i<len/2;i++){
            left.append(str.charAt(i));
        }
        
    
    }
}
